The blocked channels of phone signal jammers are usually multiple frequency bands to cover different mobile communication standards and frequency bands. Specific channels and bands may vary by device model and manufacturer.
Generally speaking, mobile phone signal jammers can block the more common mobile communication frequency bands including 2G (GSM), 3G (CDMA2000, WCDMA), and 4G (LTE). In addition, some advanced mobile phone signal jammers can also block the frequency band of the 5G network.
Here are some examples of common mobile communication bands:
2G frequency band: including GSM 900 MHz, GSM 1800 MHz, etc.
3G frequency band: including CDMA2000 800 MHz, WCDMA 2100 MHz, etc.
4G frequency band: including LTE FDD 700 MHz, LTE TDD 2300 MHz, etc.
5G frequency band: including n78 (3.3-3.8 GHz), n41 (2.5-2.7 GHz), etc.
Different signal jammers for cell phone may support different frequency bands and channel combinations, and the specific blocking range should be confirmed according to the device's specifications and instructions. When using a cell phone signal jammer, you should ensure that the device you choose can cover the required frequency bands to achieve the desired shielding effect.